Beer, Samuel H.
Modern British politics : a study of parties and pressure groups /​ by Samuel H. Beer.
Faber and Faber, 1971
 Buku Teks
Mahood, H. R.
Pressure groups in American politics/ H. R. Mahood.
Scribner, 1967
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Beer, Samuel H.
Treasury control : the co-ordination of financial and economic policy in Great Britain / by Samuel H. Beer
Clarendon Press, 1957
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Michels, Robert, 1876-1936, author
Political Parties : a sociological study of the oligarchical tendencies of modern democracy
Collier Books, 1962
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Eldersveld, Samuel J.
Political parties in American society / Samuel J. Eldersveld
Basic Book inc, 1982
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